Stud driving tool



Oct. 14, 1958 J. F. HAMLIN 2,855,601

STUD DRIVING TOOL Filed June 5, 1956 /c 2 I 23 /GJ INVENTOR. JERRY I? HAML IN ATTORNEYS United States Patent STUD DRIVING TOOL Jerry F. Hamlin, San Rafael, Calif.

Application June 5, 1956, Serial-No; 589,496

4 Claims. c1. 1-47 This invention relate'sto studdriving tools of the kind employed for driving steelstuds or pins'in hard materials :such as concrete or metal. The'term stud as used herein relatesto any stud-like memberhaving either a head or thread atits outer end'so that it maybe used as a nail, a threaded bolt or other fastening device.

It is common practice to'dr'ivestu'ds into hard material both with a gun carrying an'explosive driving charge and with a stud guide and hammer. The present invention relates to themanual-or hammer actuated stud driving type of tool. t I

' It is'an object of this invention to provide an improvedstud-driving tool-'whichmay readily be employed in a horizontal position and an inverted' position" as" well as in the'usual upright position. 7

A further object'is to provide such a-tool witha. guided hammer of considerable weight to enable the user to drive astu'd with a minimurd ofblows' and relatively little'effort':

A still'further object isto provide a tool of this kind capable of use in close quarters or near a wallor otherstructure projecting from the surface where the stud is' to be driven.

Still; further objects" and: advantages of r the invention are made apparent inthe following specification wherein reference is made to the accompanying drawings for a detailed description of a preferred embodiment of the .'inventionand' the manner inwhich it is used.

In the drawings:

Fig. 1 is a'viewof a workman using the stud driver of the-present-invention for driving the stud into an -overhead lsurface;.

Fig. 2-is an-elevation with parts-in section of a stud driving tool" embodying the present. invention;

.Fig. 3yisia similar view of the drivingend of-the tool with a s tud inr place therein in readiness to bedriven;

Fig. 4 is a similar view showing the stud after it has been driven;

Fig. 5 is a perspective view of the stud guide portion of the tool; and

Fig. 6 is a perspective view of a typical stud illustrated with a guide bushing in place thereon.

Referring first to Fig. 2 of the drawings, the stud driving tool of the present invention is illustrated as having a :separate stud guide element comprising a base flange 10 'with an upright cylinder 11 formed integrally therewith. 'T he cylinder is bored adjacent its lower end as at 12 to receive and guide a stud to be driven and adjacent its upper end as at 13 to receive and guide a portion of the .anvil presently to be described.

An anvil is shown as having a body portion 14 with a *centrally depending cylindrical aligning boss portion 15 adapted to extend into the bore 13 of the stud guide. At its lower end the boss portion 15 carries a driving pin 16 which is threaded in place and secured by a lock nut 17. The driving pin is thus removably mounted so that it may be replaced by pins of different lengths for driving studs The anvil 14 also has a dependin of different lengths.

skirt 18 spaced from the central boss member 15 to provide an annular chamber 19 which surrounds the stud guide as illustrated in Figs. 3 and 4 while the tool is in This skirt 18 makes it possible for the user to hold the stud guide against asurface into which a stud is use.

to be driven even in an inverted position such as illus trated in Fig. 1 and provides a handle by means of which i the-anvil may beheld without danger of striking the operators hand with'the hammer. This skirt or handle portion may be somewhat longer'than illustrated if desired.

Projecting upwardly or in a direction away from the driving pin of the anvil is a hammer slide in the form of sidered as heavy as should be used in this type of work but the present guided hammer may be considerably heavier to impart a more forceful blow without unduly tiring the user.

Fig; 5 shows the stud guide as having its base portion 10 cut away on one side as illustrated at 24 so that its center or driving pin guide 12 may be placed closely adjac ent'a wall or any structural member disposed normal to the surface into which the stud is to be driven.

A typical stud is illustrated at'Fig. 6 as having a pointed shank 25 and a head 26 so that it is similar in appearance to a nail. A radially finned'guide bushing 27 is slidable on the shank of the stud and held thereon by slight friction. This bushing serves to center the shank of the stud in the stud guide section 12 in the manner illustrated in Fig. 3 and is made of a soft or crushable plastic material so that it is destroyed or crushed by-the head ofthe stud when it is driven.

In operation of the stud driving tool, the parts are first placed in the position illustrated in Fig. 3 with the stud in its guide, the base of whicnis placed flat against the surface 23 into which the stud is to be driven. The hammer 21'is then movedforcibly from the full line position of Fig. 2 to the broken-line position where vit strikes the anvil 14 and agfew such hammer blows'are,

effectiveto drivethe stud-into-ithe position illustrated in Fig. 4. The anvil is meanwhile being grasped by its skirt 18 in one hand of the user while the other hand of the user actuates the hammer 21.

As is clearly shown in Figs. 3 and 4 of the drawings, the cylindrical boss portion 15 of anvil 14 is embracingly received in bore 13 of the stud guide 11. As the boss portion 15 is driven into the stud guide during the stud driving operation, it is retained against any unwarranted lateral shifting due to its relatively snug, yet freely slidable, engagement with the stud guide passage. Furthermore, the skirt section 18 of the anvil also assists in preventing lateral shifting or misalignment of the stud guide and the anvil member due to its sliding engagement with the external surface of the stud guide. The above described interfitting engagement of the anvil section and the stud guide member insures proper driving of the stud member into the receiving surface without the danger of the anvil and guide becoming misaligned which would require additional force to be applied to the hammer during the actual driving of the stud.

I claim:

1. In a stud driving tool assembly, an anvil member Patented Oct. 14, 1958-:

comprising a hammer slidably mounted on a guide bar extending from one end of said anvil and an elongated boss portion depending from another end of said anvil, a skirt portion similarly depending from said anvil and spacedly surrounding said boss portion, said skirt por-' tion being of substantial length and providing a handle for manual grasping during use, said boss portion having means provided at the end remote from said anvil for adjustably and securely maintaining a stud driving pin in operative position on the boss portion, said means permitting interchangeable engagement of driving pins of different lengths and character with said boss portion, the boss portion and encircling skirt portion of said anvil being, so spaced that an internally recessed portion of a stud guide adapted to be used therewith is snugly receivable in relative sliding relationship between said skirt and boss portion thereby precluding undesirable misalignment of said anvil relative to said stud guide during the stud driving operation.

2. A stud driving tool assemblycomprising interfitting stud guide and anvil members; said stud guide member being adapted to receive a stud and support the same adjacent a receiving surface into which the stud is to be driven and comprising an elongated tubular portion fixed to a base flange and extending therefrom, said tubular portion having a passage extending therethrough, an end portion of said passage adjacent said flange being adapted to receive and guide a stud to be driven, the opposite end portion of said passage being adapted to receive telescopically said anvil member; said anvil member comprising a body portion having a striking surface, an elongated bar of smaller, transverse dimension than said striking surface secured thereto and extending therefrom, a hammer slidably retained on said bar and adapted to be forcibly driven against said striking surface, a skirt and an elongated boss extending from saidbody portion in a direction opposite from said bar, said boss being positioned internally of said skirt to provide an annular chamber therebetween in which said stud guide tubular portion is receivable, said boss portion including means for securely yet removably mounting a stud driving pin thereon; said anvil being insertable into said stud guide with "said stud driving pin and said boss snugly yet slidably positioned in said passage and said stud guide tubular portion snugly yet slidably positioned in said anvil annular chamber, said skirt performing the dual function of cooperating with said boss in maintaining said members properly aligned and providing a handle whereby said tool assembly may be grasped during a stud driving operation.

3. The tool assembly of claim 2 wherein the transverse outer dimension of said boss is substantially equal to the transverse dimension of said opposite end portion of said passage of said stud guide whereby said boss 4, substantially fills said opposite end portion when said stud guide and anvil are interfitted.

4. A stud driving tool assembly comprising interfitting stud guide and anvil members; said stud guide member being adapted to receive a stud and support it adjacent a receiving surface into which the stud is to be driven and comprising an elongated substantially cylindrical portion and an enlarged base flange extending laterally from one end of said cylindrical portion and including an outer face lying substantially in a single plane, said cylindrical portion having a stud receiving guide passage extending thereinto from said flange outer face and an enlarged aligning passage extending there- ;into from the and opposite said flange face, said passages being axially aligned and communicating with each other between the ends of said stud guide; said anvil member comprising a body portion having a striking surface, an elongated bar extending away from said striking surface and substantially normal thereto, a hammer slidably retai'ned'on said bar and adapted to be forcibly driven against said striking surface, a cylindrical skirt and an elongated boss extending from said body portion in a direction opposite from said bar, said boss being positioned internally of said skirt to provide an annular chamber therebetween, and a stud driving pin removably connected to said boss for engaging and driving a stud when said stud guide and anvil members are interfitted and said hammer is driven against said strik- Ving surface of said anvil body portion; said cylindrical portion of said stud guide being snugly yet slidably receivable in said annular chamber between said anvil member skirt and boss with said boss snugly yet slidably receivable in said aligning passage and said stud driving :pin snugly yet slidably receivable in said stud receiving guide passage, whereby said stud guide and said anvil members are automatically aligned and retained in proper alignment without substantial relative lateral shifting when a stud in said guide passage is driven by forcibly driving said hammer against said striking surface with one hand while said skirt portion is grasped with the other hand to maintain said base flange in face to face engagement with said stud receiving surface to insure proper entry of saiddriven stud into said receiving surface.

References Cited in the file of this patent UNITED STATES PATENTS 101,424 Brown Apr. 5, 1870 585,697 Pollard July 6, 1897 1,164,086 Gooding Dec. 14, 1915 1,237,360 Martin Aug. 21, 1917 2,475,041 Mattson July 5, 1949 2,676,508 Erickson Apr. 27, 1956 2,767,399 Widener Oct. 23, 1956 

